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xfi's were built specifically for FE. lots of websites around explaining the difference... links to which are in a couple current active threads (sorry, don't remember them off hand).
most significantly, the cam and tranny is different in the xfi than in other models. as to the LSi specifically, i think that was just a trip package (fancier stuff) than the standard base model (the xfi being the least trimmed out of them all)... but i could be wrong on that one.
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